?? xqromb.cpp
字號(hào):
#include <iostream>
#include <iomanip>
#include <cmath>
#include "nr.h"
using namespace std;
// Driver for routine qromb
// Test function
DP func(const DP x)
{
return x*x*(x*x-2.0)*sin(x);
}
// Integral of test function func
DP fint(const DP x)
{
return 4.0*x*(x*x-7.0)*sin(x)-(pow(x,4.0)-14.0*x*x+28.0)*cos(x);
}
int main(void)
{
const DP PIO2=1.570796326794896619;
DP a=0.0,b=PIO2,s;
cout << "Integral of func computed with QROMB" << endl << endl;
cout << fixed << setprecision(6);
cout << "Actual value of integral is ";
cout << setw(12) << (fint(b)-fint(a)) << endl;
s=NR::qromb(func,a,b);
cout << "Result from routine QROMB is " << setw(12) << s << endl;
return 0;
}
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